I remember when ANY bad word against the Kennedys was absolutely VERBOTEN. It lasted up until the early 90s at least.
Then all the Kennedy cronies died away, and the grandchildren generation’s foibles were at least reported on. by the 2000s even PBS ran a documentary about JFKs pain-killer addiction and affairs in the White House.
RFK Jr. going over to Trump probably removed any reticence among old-leftists to criticize the Kennedy family.
The Kennedys were almost equal with the Pope back then.
Even the rascal Teddy, who cheated in Harvard, drowned a girl in the pond, and drowned his liver in Crown Royal, could not be criticized. Not unless you wanted to get the bum's rush out into the street.
They are going to come after RFK Jr however, since he's running with Trump these days.